Center-finder.



J. OGG.

CENTER FINDER. APPLICATION FILED urns. 1914 1,1 05,91 7. Patented Aug. 4., 1914,

IN VENTOR THE NORRIS PETERS (0-, PHOTO-LI'IHO. WASHINGTON. D C

Pahala, in the Province of Kain and Terri-l tory of Hawaii, have invented new and use.

JAMES ooe, or PAHALA, 'rnnnrronv OFiI-IAWLAII.

CENTER-FINDER.

Specification of Letters Patent.

PatentedAug. 4, 1914.

Application filed Ianuaryfi, 1914. Serial No. 810,337. l I

To all whom it may concern: p p

Beit known that. I, JAMES \OGG, a subject of the King of England, residing at ful Improvements in Center-Finders, of whichthe following is a specification.

This invention relates to a center finding tool.l

The object of the present invention is to provide asimple, easily operated, convenient tool to be used by machinists and other mechanics for finding or maintaining the center within a cylinder or like device, when liningup machinery,and which is also useful for laying out work or flanges and like parts.

The invention consists of the parts and the construction and combination. of parts as hereinafter more fully described and claimed, having reference to the accompa nying drawings, in which- Figure 1 is a perspective view of the center finding tool. Fig. 2 is an end view of a cylinder or flange showing the application of the tool for the purpose of locating the same. Fig. 3 is a cross section on line X-X, Fig. 2.

Referring to the drawings, A indicates a fiat bar,qdovetailed in cross section, upon which is slidably mounted a pair of fanshaped plates 2 and .3 provided with upwardly extending lugs A and 5. The lugs 4 and 5 have threaded openings formed therein adapted to receive a right and lefthand threaded screw r 6. The screw 6 is provided with a fixed nut 7 by which it may be turned.

The bar A is provided with a center :hole 8, and the nut is provided with a plurality of perforations 9 which extend through the nut and screw and are also adapted to be brought into alinement with the center hole 8, being always held in alinement by a lug 10, formed on the bar A and extending into a groove 11 formed on the nut.

The tool may be placed within the. in-

terior of the cylinder or flangeand' adjusted in position to find the center thereof by turning the nut 7 with connected screw 6, until the plates 2 and 3 have been moved out on the bar A into a position where their outer 1 cont-acting points 12 have engaged with the interior surface of the flange or cylinder. The center of the cyllnder is thus quickly found and may also be maln tained by leaving the center finding tool in the position shown in Fig.2. The outer contact points of the plates 2 and 3may also i berecessed, as indicated at 13, andmay thus be placed on the surface of the end of the cylinder or flange for the purposeof finding the center, as indicated in Fig. 2.

Any one of the several openings 9, formed in the nut 7, may be brought into alinement with the center hole 8 of the bar A and a sight may thus be taken through that hole which registers with the center opening on the object to be lined up with. It can thus be seen that a perfect alinement of a cylinder, with relation to the crank-shaft of the a machine, may be quickly secured, as the center finding tool may be easily placed, in

position. Similarly a center may be maintamed and worked from for other purposes, such as patterns and the like.

The tool constructed as here shown is: neat 1n appearance, simple and substantial 1 in construction and may be quickly adjust ed, withrelation to any diameter ofcircle or opening,1by simply turning the nut in the desired direction to either expand or contract the contacting points 121 of the plates 2 and 3. The materialsandfinishof theseveral parts of the device are such as experience and udgment of the manufacturer :may dictate.

Having thus described my invention, what I claim and desire to secure by Letters Patent- 1. Acenter finding tool comprising a bar having a center opening formed threin, a pair of plates slidably mounted on said bar, lugs formed on the plates, :1 right and lefthand threaded screw extending, through said lugs,and a fixed nut on said screw,

having a plurality of openings extending.

therethrough, any one of which maybe brought into alinement with the center:

opening.

2. A center finding tool comprising a bar having a center openingformed therein, a pair of plates slidably mounted on said bar, lugs formed on the plates, a right and lefthand threaded screw extending through said lugs, a fixed nut on said screw having a plurality of openings extending therethrough an annular groove formed in the nut, a projecting lug extending into said groove formed on the bar, and means for holding the plates on the bar.

3..A centerfinding tool, comprising a bar having a Center opening fo rmed therein, with the center opening, and recessed seats a pairof fan-shaped platesslidablymount: formed in the, outer corners of the faned on said bar with the flared ends of the shaped plates, suhsfantielly asdescribed. plates outermost, lugs formed on the inner";@ In; testimony whereof I have hereunto set 5 ends of said plates, a right and left-hand nay hand in the presence of two subscribi5 1 thneazdedp. screw extending through: said ling wiiu'lesse's.

lugs to move the-plates in unison, a' fixed JAMES 'OGG. nut on said screw having a, plurality Of: Witne sses: openings extending therethrough, any .one DAVID JAMI S N, 10 of "v'vhieli ma be brdught in'to alinement 1 LAURENCE CI PALMER. 

